Abstract

The City of Edmonton operates and maintains over 5,000 km of sewer pipes. The collection system is made up of about 42% storm sewers, 39% sanitary sewers and 19% combined sewers. Storm drainage is captured and discharged to the North Saskatchewan River. Flows from the combined sewer area and the sanitary sewerage system are collected and discharged to the Gold Bar Wastewater Treatment Plant. This chapter presents the development and applications of the Clareview and Pilot Sound Storm Drainage Model. The study area is approximately 1350 ha and located on the north east side of the City servicing a population of about 18,000 mainly residential with portions of commercial, community services and industrial.

A storm model was developed using DHI’s Mike Urban and Mike Flood to represent approximately 69 km of 1,200 pipes and 370 sub-basins within the study boundary. Pipe diameters vary from 200 mm to 2250 mm. The model also includes a pump station, five stormwater detention facilities and a number of flow diversion control structures. The main components of the study include development of model parameters and the drainage network, calibration and verification of the model, assessment of the capacity constraints of the existing system under various storm events, evaluation of the performance of the stormwater detention facilities under severe stormevents, determination of system upgrade alternatives and the requirement for servicing the ultimate development stage and land use. The analysis also included a fully integrated and automated two-dimensional surface flooding model that connects the minor system (storm sewer network) with the major system (overland flow routes). Animation of the two-dimensional model simulation results were used to illustrate the extent of surface flooding within the study area.

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